Re: [PATCH net-next 2/3] net: mscc: ocelot: refine the ocelot_ace_is_problematic_mac_etype function

[kbuild test robot <lkp@intel.com>]

Hi Vladimir,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]
[also build test WARNING on next-20200421]
[cannot apply to net/master linus/master sparc-next/master v5.7-rc2]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Vladimir-Oltean/Ocelot-MAC_ETYPE-tc-flower-key-improvements/20200422-113906
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git b6246f4d8d0778fd045b84dbd7fc5aadd8f3136e
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-191-gc51a0382-dirty
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)

>> drivers/net/ethernet/mscc/ocelot_ace.c:747:17: sparse: sparse: cast to restricted __be16
>> drivers/net/ethernet/mscc/ocelot_ace.c:747:17: sparse: sparse: cast to restricted __be16
>> drivers/net/ethernet/mscc/ocelot_ace.c:747:17: sparse: sparse: cast to restricted __be16
>> drivers/net/ethernet/mscc/ocelot_ace.c:747:17: sparse: sparse: cast to restricted __be16
   drivers/net/ethernet/mscc/ocelot_ace.c:748:16: sparse: sparse: cast to restricted __be16
   drivers/net/ethernet/mscc/ocelot_ace.c:748:16: sparse: sparse: cast to restricted __be16
   drivers/net/ethernet/mscc/ocelot_ace.c:748:16: sparse: sparse: cast to restricted __be16
   drivers/net/ethernet/mscc/ocelot_ace.c:748:16: sparse: sparse: cast to restricted __be16

vim +747 drivers/net/ethernet/mscc/ocelot_ace.c

   739	
   740	static bool ocelot_ace_is_problematic_mac_etype(struct ocelot_ace_rule *ace)
   741	{
   742		u16 proto, mask;
   743	
   744		if (ace->type != OCELOT_ACE_TYPE_ETYPE)
   745			return false;
   746	
 > 747		proto = ntohs(*(u16 *)ace->frame.etype.etype.value);
   748		mask = ntohs(*(u16 *)ace->frame.etype.etype.mask);
   749	
   750		/* ETH_P_ALL match, so all protocols below are included */
   751		if (mask == 0)
   752			return true;
   753		if (proto == ETH_P_ARP)
   754			return true;
   755		if (proto == ETH_P_IP)
   756			return true;
   757		if (proto == ETH_P_IPV6)
   758			return true;
   759	
   760		return false;
   761	}
   762	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org